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The ultrastructure of articular cartilage in the prenatal domestic cat

The ultrastructure of articular cartilage in the prenatal domestic cat

Acta Veterinaria Brno 62(3-4): 115-120

The articular cartilage of 11 foetuses of the domestic cat, both males and females, was studied at 30, 40 and 48 days after fertilization. The tissue samples were collected from the femoral heads and processed by standard methods for observation by light and transmission electron microscopy. In the period studied, the cartilage surface was covered with the chondrosynovial membrane. Bundles of aperiodic filaments were seen under as well as of the cartilage surface, being a part of the membrane structure. Collagen fibrils, found in low numbers, were running in various directions in the ground amorphous substance. Chondrocytes in the surface layer were situated in two parallel rows. They had oval or spindle-like shapes, contained large nuclei and few organelles in the cytoplasm. Glycogen and lipid droplets occurred rarely. Occasional chondrocytes with atypical cilia were seen in the surface and deep layers. Of interest was a finding of erythrocytes in the intercellular matrix of the deep layer.

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